☣️ UN 1622 • CLASS 6
Magnesium arsenate
Placard: Toxic. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
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Quick details
UN 1622
Class: 6
Placard type: Toxic
ERG: Guide 151 (check current ERG)
Isolation: ERG 151: isolate spill 25m all directions; isolate 50m if large spill; evacuate immediate area and downwind if airborne powder suspected
Chemical & Response Details
| Also known as | Trimagnesium diarsenateMagnesium arsenate tribasicArsenate of magnesiumMagnesium salt of arsenic acid |
| CAS Number | 7784-36-3 |
| Appearance | White or grayish-white odorless powder or crystalline solid at room temperature. May appear as granules or lumps. |
| Flash Point | Not applicable (inorganic solid, non-flammable) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid with negligible vapor pressure) |
| Water Reactivity | Slightly soluble in water; no violent reaction but may release toxic arsenic compounds over time |
| Extinguishing | Water spray, fog, or dry chemical suitable; no special foam restrictions for fire control |
| PPE | ⚠️ Level B minimum; SCBA mandatory; full chemical-resistant suit required; avoid all skin contact due to extreme toxicity |
| Isolation | ERG 151: isolate spill 25m all directions; isolate 50m if large spill; evacuate immediate area and downwind if airborne powder suspected |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive
- Containers may explode when heated.
- Runoff may pollute waterways.
First actions (field-minded)
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
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UN 1622 — Magnesium arsenate HAZMAT RADIO NOTE — UN 1622
Product: Magnesium arsenate
Class 6 / Toxic / ERG 151
PPE: Level B minimum; SCBA mandatory; full chemical-resistant suit required; avoid all skin contact due to extreme toxicity
ISOLATION: ERG 151: isolate spill 25m all directions; isolate 50m if large spill; evacuate immediate area and downwind if airborne powder suspected
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 1622 — Magnesium arsenate
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: White or grayish-white odorless powder or crystalline solid at room temperature. May appear as granules or lumps.
Water Reactivity: Slightly soluble in water; no violent reaction but may release toxic arsenic compounds over time
Extinguishing: Water spray, fog, or dry chemical suitable; no special foam restrictions for fire control
PPE: Level B minimum; SCBA mandatory; full chemical-resistant suit required; avoid all skin contact due to extreme toxicity
Isolation: ERG 151: isolate spill 25m all directions; isolate 50m if large spill; evacuate immediate area and downwind if airborne powder suspected
— Key Hazards —
• Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
• Avoid any skin contact.
• Fire may produce irritating, corrosive and/or toxic gases.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
SOURCE: allfirefighter.com/hazmat/un/1622 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1622 Magnesium arsenate Cls6 ERG151 | ERG 151: isolate spill 25m all directions; isolate 50m if large spill; evacuate | allfirefighter.com/hazmat/un/1622SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions. Page: https://allfirefighter.com/hazmat/un/1622
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FAQ
Highly toxic, may be fatal if inhaled, ingested or absorbed through skin. Avoid any skin contact. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive Containers may explode when heated. Runoff may pollute waterways.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level B minimum; SCBA mandatory; full chemical-resistant suit required; avoid all skin contact due to extreme toxicity
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 151 and your department SOP/SOG for incident-specific protective actions.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles. This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.